Automatic balancing device for swgng-saws



, J.'R0SS. 1 AUTOMATIC BALANCING DEVICE 30R SWING SAWS.

No. 410.,199. Patented Sept. 3, 1889.

(No Model.)

Inventor flttorrwy,

Witnesses:

UNITED STATES PATENT OFFICE.

JOSIAH ROSS, OF BUFFALO, NEWV YORK.

AUTOMATIC BALANCING DEVICE FOR SWlcNG-SAWS.

SPECIFICATION forming part of Letters Patent No. 410,199, dated. September 3, 1889.

Application filed November28, 1888. $erial No. 292,053. (No model.)

To all whom, it iztrtg concern- Be it known that I, JOSIAH Ross, of Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements on an Automatic Balancing Device for Swing-Saws; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification,which will enable others skilled in the art to which it appertains to make and use the same.

My present invention has general reference to an improvement in automatic balancing attachments to swing-saws; audit consists, es-

sentially, in the novel and peculiar combinat1on of parts and details of construction, as herelnafter first fully set forth and described,

and then pointed out in the claims.

In the drawings already referred to, which serve to illustrate my said invention more fully, Figure 1 is a side elevation of my im proved swing-saw. Fig. 2 is a front elevation of the same. Fig. 3 isa transverse sectional elevation in line 00 0c of Fig. 1.

Like parts are designated by corresponding letters of reference in all the figures.

The object of my invention is the production of a serviceable and efficient device for automatically balancing swingsaws. T0 at tain this result I construct my swing-saw essentially as follows:

A is the usual pendent frame of a swingsaw. It is pivoted to ashaft C on its bifurcated upper end A- said shaft being suspended by means of hangers C, as clearly shown in the drawings. To the lower end of this frame I arrange bearingsfor the saw-mandrel D, the latter having the driven pulley d and the saw B. This saw-mandrel is revolvedby the tight pulley D, placed upon the shaft 0, and the latter in turn driven by a set of tight and loose pulleys E. To the frame A, at a suitable point, I attach a curved frame F,within which I place acircular weight Gr, said weight having a circumferential groove g, Fig. 3, engaging the web 6 of said frame in such a manner that it can readily revolve and travel upon said rail or web as soon as the saidu'ail is elevated on one or the other end, which it will do when the saw-frame is swung forward or backward by means of the usual handle J.

F has lugs H, by means of which it is fastened to the saw-frame A in any desirable manner.

It has on its end upwardly-turned curvatures f f, which form, as it were, inclines at a and b, so that when the swing-frame A is pushed back, so as to lower the forward end of the frame F, said weight,when moving forward, will travel upon the incline (abut return as soon as gravity has overcome its inertia, so that the weight will not strike the end of the frame F,which would be somewhat objectionable. These inclines on-both ends of the frame F form stops; but bumpers of some other form may be adopted without changing the nature of my invention.

In operation the lumber to be sawed is placed upon the bed K and the saw pulled forward. This will cause the weight G to travel rearward toward the curvature f, and when the saw frame hangs perpendicular said Weight will occupy a position nearly midway between the ends or curvatures; but as soon as the frame A is moved forward of the vertical center line the weight will immediately travel toward the curvature f and retain a position which will cause the saw-frame to remain in whatever position it may be placed by the operator. This result is accomplished by the peculiar curve of the track-frame F, causing the rolling weight to move away from the perpendicular center line of the machine (from the centerof the shaft C) in a direction opposite to that in which the saw-frame is swung, and by increasing its distance from such center line also increases its gravitating 'force,with which it acts upon said swing-saw frame, and thus counteracts the gravitating force of said swinging saw-frame. The weight G will not roll to the ends f or f of the trackframe F on the slightest motion of the sawframe out of perpendicular, but will move (in opposite direction, as stated) a certain distance only, corresponding to that to which the saw-frame is moved. It will roll to the ends of the track only when the saw-frame is moved IOO to the extreme limits of its swing. The weight G remains stationary as long as the saw-frame is not moved, and will therefore retain the saw-frame in any position within its limit of motion. It requires a slight effort of the operator to disturb the equilibrium of the parts; but as soon the saw-frame is held for but a moment in any desired position to give the weight G time to roll to its new position it will again retain the saw-frame in such new position. It will therefore be seen that this device acts entirely automatic, and since it,

in keeping the saw-frame in balance, relieves ing balance consisting of the pendent sawframe, a curved track secured to said frame, and an automatically-shifting weight operating upon said track, as and for the purpose set forth.

2. In swing-saws, an automatically-operating balance for the saw-frame, consisting of an automatically-shifting Weight arranged upon a curved track having stops for said.

weight to limit its travel, said track being attached to-and operating in combination with the swinging frame, as and for the purpose stated.

3. In swing-saws, an automatic balance for the swinging frame, consisting of an au tomati- Cally-sh fting weight operating upon a curved track having curved end stops, as stated, said curved track being secured to the swinging frame and operating in combination therewith, as and for the purpose specified.

4:. In swing-saws, the combinatiomwith the swinging frame, of the curved track-frame F, having the gap, as described, and the rolling weight, said gap" being provided with the inset I, as set forth.

5. In swinging saws, the combination, with the pendent saw-frame, of the curved trackframe having circular track weight and curved end stops, as stated.

6. In swing-saws, the combination, with the swinging saw-frame, of the track-frame having the web 6, the weight G, having the groove 9, and the removable inset I, secured by a bolt 1', as stated.

In testimony that I claim the foregoing as my invention I have hereto set my hand in the presence of two subscribing witnesses.

JOSIAH ROSS.

Attest:

MICHAEL J. STARK, \V M. O. STARK. 

